UAI may refer to:
- Union Académique Internationale, French for International Union of Academies
- Universities Admission Index
- Union astronomique internationale, the French name for the International Astronomical Union
- Unione Astrofili Italiani
- Universal Armament Interface
- Universidad Adolfo Ibáñez, Spanish for Adolfo Ibáñez University
- Universidad Abierta Interamericana, Spanish for Interamerican Open University
- Unprotected Anal Intercourse
- Uruguayan Antarctic Institute
- Uncertainty avoidance index, the amount of tolerance of unpredictability
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